CN104854341B - Piston type fuel pump for internal combustion engine - Google Patents
Piston type fuel pump for internal combustion engine Download PDFInfo
- Publication number
- CN104854341B CN104854341B CN201380065757.2A CN201380065757A CN104854341B CN 104854341 B CN104854341 B CN 104854341B CN 201380065757 A CN201380065757 A CN 201380065757A CN 104854341 B CN104854341 B CN 104854341B
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- China
- Prior art keywords
- piston
- pump
- type fuel
- fuel pump
- piston type
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- 239000000446 fuel Substances 0.000 title claims abstract description 84
- 238000002485 combustion reaction Methods 0.000 title abstract description 8
- 238000007789 sealing Methods 0.000 claims abstract description 85
- 239000004033 plastic Substances 0.000 claims description 38
- 229920003023 plastic Polymers 0.000 claims description 38
- 239000004696 Poly ether ether ketone Substances 0.000 claims description 8
- 239000004952 Polyamide Substances 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 8
- 229920002647 polyamide Polymers 0.000 claims description 8
- 229920002530 polyetherether ketone Polymers 0.000 claims description 8
- 230000004323 axial length Effects 0.000 claims description 2
- 230000002349 favourable effect Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000009423 ventilation Methods 0.000 description 4
- 230000003321 amplification Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 235000006508 Nelumbo nucifera Nutrition 0.000 description 1
- 240000002853 Nelumbo nucifera Species 0.000 description 1
- 235000006510 Nelumbo pentapetala Nutrition 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000004512 die casting Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000002828 fuel tank Substances 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 239000000289 melt material Substances 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
- F04B53/14—Pistons, piston-rods or piston-rod connections
- F04B53/143—Sealing provided on the piston
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
- F02M59/02—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
- F02M59/02—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type
- F02M59/025—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by a single piston
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
- F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
- F02M59/442—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston means preventing fuel leakage around pump plunger, e.g. fluid barriers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B15/00—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts
- F04B15/02—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts the fluids being viscous or non-homogeneous
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
- F04B53/14—Pistons, piston-rods or piston-rod connections
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/56—Other sealings for reciprocating rods
Abstract
Piston type fuel pump (18) for internal combustion engine includes pump gas cylinder (40) and the pump piston (28) being movably received in the pump gas cylinder (40).It is proposed, by means of at least one first and at least one second guide section (51,72) radially it is oriented to the pump piston, and first and second guide section is spaced from each other in the axial direction, wherein, first guide section is arranged in the pump gas cylinder of the piston type fuel pump, and second guide section is arranged in towards in the region of the end section (52) of the drive device (29) in radially outer.In addition propose, the piston type fuel pump (18) has the supporting structure and sealing structure (46) for the pump piston (28) on first guide section (51), and the supporting structure and sealing structure include being used for the guiding area (48) for being radially oriented to the pump piston (28) in the pump gas cylinder (40) and the sealing area (50) with sealing lip.
Description
Technical field
The present invention relates to a kind of piston type fuel pump.
Background technology
From the fuel system of internal combustion engine known to market, in the fuel system, fired by means of the piston type of Mechanical Driven
Fuel from fuel tank is transported in fuel rail by material pump under high pressure.Therefore, it is provided with piston type fuel pump removable
The pump piston supported dynamicly, the pump piston are compressed in the fuel in the conveying chamber of piston type fuel pump.Pump piston serves as a contrast in piston
Slided by being fitted close in set and be directed to small seal clearance.It is living in order to support and seal by clearance seal
Plug bushing must have certain length and receive big cross force if necessary.Therefore, piston bushing is generally by steel making.This
Outside, due to high tolerance, use so-called " piston pairing ", i.e. the piston for determination of attaching troops to a unit to each pump case.In addition,
Cylinder in pump case must the honing of bothersome ground.
The content of the invention
The problem of present invention is based on solves by the piston type fuel pump according to the present invention.It is in addition, other for this
Important feature is found in the following description and in the accompanying drawings for invention.
The present invention relates to a kind of piston type fuel pump with pump piston, the pump piston has an end towards drive device
Portion's section.According to the present invention, pump piston is by means of at least one first guide section and at least one second guide section in footpath
It is directed to upwards, wherein, the first guide section and the second guide section are spaced from each other in the axial direction.First guide section is arranged
In the pump gas cylinder of piston type fuel pump, and the second guide section is arranged in the described towards driving of pump piston in radially outer
In the region of the end section of device.Therefore, pump piston be directed on two notable spaced bearing positions and/or
Supporting.On the one hand, it is oriented to by the first guide section and is supported in other words, on the other hand, is carried out by the second guide section
Guiding supports in other words.Here, supporting-point is located at power to corresponding guiding point in the corresponding end section of pump piston in other words
Near application point, cross force, such as the drive device (cam driving gear) in pump piston are may occur in which on the point of force application
Around.Therefore, can reduce in the guiding point load on supporting-point in other words.In addition, the present invention has the advantage that：It can subtract
Fuel leaks in other words for the oil leakage of few piston type fuel pump, and its mode is that the second guide section is as additional scraper element
Work.In addition, can reduce pump piston due to unintentionally caused by cross force axially inclined (" deflected condition ").Thus also may be used
Improve the fatigue strength of piston type fuel pump.
In a configuration of piston type fuel pump, the second guide section is directly adjacent to piston seal arrangement.Thus may be used
Reduce the cross force that is applied on piston seal and therefore prevent the abrasion of piston seal and additionally reduce oil to let out
Fuel leaks in other words for leakage.
In addition, settable, the second guide section is arranged on that side towards drive device of piston seal.Thus it is real
Especially big axial spacing between present first and second guide section, it thus especially can also more strongly reduce described horizontal stroke
Xiang Li.
In another configuration of piston type fuel pump, the piston type fuel pump includes sealing bearing, and the sealing bearing is not
But fixed piston seal and fix the second guide section.It is achieved in the particularly compact and durable arrangement of the element.
When piston seal has the sealing lip that at least two oppositely arrange in the axial direction on inner radial section,
The sealing function of piston seal can be improved.Thus, not only when pump piston moves upwards but also when pump piston moves downward
Realize particularly preferred effect.
In addition, settable, piston seal includes at least one diametrically circular protuberance on radially outer section
The sealing section of shape.Thus the sealing function between the inwall of bearing can be improved in piston seal and seal, thus can be again
Reduce oil leakage and/or fuel leakage.The sealing section of protuberance shape can also be only used for piston seal is not removable in the axial direction
It is fixed on dynamicly on sealing bearing.
In another configuration of piston type fuel pump, the second guide section is radial direction annular and with essentially L-shaped
Cross section.Thus, the second guide section can especially be sealed and be fixedly placed on sealing bearing particular by force closure.By
This can be improved particularly the fatigue strength of piston type fuel pump.
In another configuration, the radial clearance and the axial direction of the second guide section between the second guide section and pump piston are long
The ratio of degree is less than 0.01.Thus the function of the second guide section can be improved again.Second guide section is especially because such as gap
Small radial clearance as sealing and work.
The other configuration more particularly to the first guide section of piston type fuel pump.Therefore, according to the piston type of the present invention
Petrolift by means of the second guide section (as described above) and/or can pass through the described below of the first guide section
Other improves according to configuration of the invention.
Especially settable, pump piston has the supporting structure and sealing structure for pump piston on the first guide section,
Wherein, the supporting structure and sealing structure include being used for the first guiding area for being radially oriented to pump piston in pump gas cylinder,
And including the sealing area with sealing lip.The innovative feature of supporting structure and sealing structure that is previously mentioned and just
In this point can independently of further feature in other words with further feature claimed in any combination.The supporting structure and close
Seal structure has the advantage that it is no longer to force that the corresponding height of piston bushing and piston in piston bushing, which precisely coordinates,
Necessary to property ground, and it therefore can save sizable cost.Instead, support and seal and be functionally split up into branch
Hold region and sealing area.Its sealing lip can realize the small, gapless of friction and therefore height accurately seals.Pass through sealing lip
Flexibly construct and at least abut under pre-tension on pump gas casing wall to produce pretension range selector.By the pretension,
Also can be in the suction stroke of piston type fuel pump, i.e. when pump piston motion is moved towards lower dead center, it is ensured that in sealing area
Sealing function.In compression travel, i.e. when pump piston moves towards top dead centre, sealing lip is (if it refers to towards conveying chamber
To) and then can be sealingly pressed on pump gas casing wall while leading fuel pressure pressure support ventilation is accounted in conveying chamber.
In addition, settable, piston type fuel pump includes plastic components, the composition supporting structure and close on the plastic components
Seal structure.By the way that the first and/or second guide section is embodied as into plastic components, cancel high tolerance, and can save
Additional honing process in the assembly line of piston type fuel pump.In addition, plastic components can be fabricated to simple die casting, by
This it can abnormal cost advantageously manufacture.The risk of " seizure of piston " caused by melt material also can be by selecting plastics first
Part avoids.
One configuration of piston type fuel pump is set, and supporting structure and sealing structure are permanently connected with pump piston, preferably
Pump piston has the convex shoulder of annular, supporting structure and sealing structure and the convex shoulder clamping and/or bonding.Preferably, support
Structure and sealing structure are implemented by means of plastic components.By the connection of plastic components and pump piston, plastic components can follow pump
The motion up and down of piston, wherein, in the case where being in clamping connection, the preferable connection is releasable and can correct ground structure
Into.Therefore, replaceable plastic components in case of wearing.
Here, convex shoulder may be arranged at around the end section towards the conveying chamber of piston type fuel pump of pump piston.
It is favourable that the end section, which nearby sets convex shoulder, because therefore guide section can be arranged in possible supporting role point in other words
Near point of force application, and the cross force occurred in the end section of pump piston can be received by plastic components.
In addition, proposing, form supporting structure and sealing structure single type.By the manufacture of the single type of plastic components,
The plastic components can for example be manufactured in only one manufacturing step by press casting procedure.
Form another configuration setting of the piston type fuel pump, supporting structure and sealing structure multi-piece type.This is favourable
Because can with it is corresponding require, i.e. for be oriented to and/or support and for sealing function requirement matchingly select it is different
Plastics are used for guiding area and for sealing areas.
It is characterised by according to another expansion scheme of piston type fuel pump of the present invention, supporting structure and sealing structure
Part mutually clamping and/or bonding.This be it is favourable because the part can with material select, i.e. guiding area and seal
The material in region is independently connected with each other.
In addition, it is contemplated that between pump gas cylinder and guiding area existing gap in about 1/100mm (millimeter) to about
In the range of 10/100mm, preferably about 3/100mm.This is favourable, because pump piston can be avoided to be stuck in by the gap
In pump gas cylinder.
In another configuration of the piston type fuel pump, the first guide section, i.e. supporting structure and sealing structure and/or
Two guide sections include plastic material, especially polyamide (PA) and/or polyether-ether-ketone (PEEK).It has been shown that plastic components by
Polyamide (PA) or polyether-ether-ketone (PEEK) manufacture in the case of can in terms of the supporting in other words of the guiding on guiding area and
Seal aspect on sealing area realizes extraordinary result.
The present invention also relates to a kind of piston type fuel pump, its have pump piston and supporting structure for the pump piston and
Sealing structure, wherein, the supporting structure and sealing structure include being used for the guiding for being radially oriented to pump piston in pump gas cylinder
Region and the sealing area with sealing lip.
Brief description of the drawings
The example of the present invention is explained in detail referring to the drawings.Accompanying drawing is shown：
The schematical diagram of the fuel system of Fig. 1 internal combustion engines, it has one of the piston type fuel pump according to the present invention
Part, in the piston type fuel pump, pump piston is diametrically directed to by means of the first and second guide sections；
Axial section of Fig. 2 piston type fuel pumps in the region similar to Fig. 1 lower zones of the second guide section
View；
Fig. 3 is according to the pump piston of prior art and acts on the first schematic illustration of power thereon；
Fig. 4 is according to the pump piston of the present invention and acts on the second schematic illustration of power thereon；
Threeth schematic illustration of Fig. 5 pump pistons together with the second guide section；
Fig. 6 is used to explain that the supporting structure for forming the first guide section and sealing to be tied according to Fig. 1 piston type fuel pump
The section diagram of the amplification of the part of structure；With
The amplification Local map that Fig. 7 illustrates according to Fig. 6 section.
In various embodiments, the element for function equivalence in all the drawings and parameter also use identical
Reference.
Embodiment
The fuel system of internal combustion engine has reference 10 altogether in Fig. 1.The fuel system includes fuel container 12, electricity
Fuel is transported in low pressure line 16 by pre- delivery pump 14 from the fuel container.The low pressure line is directed to be fired in piston type
Expect the high-pressure pump of the form of pump 18.Pressure duct 20 is directed to fuel rail 22 from the high-pressure pump.Multiple injectors 24 are engaged on the combustion
Expect on rail, the injector injects fuel directly into be associated with the combustion chamber (not shown) of the injector respectively.
Piston type fuel pump 18 includes the pump case 26 only partially drawn, and pump piston 28 is movably in the pump case
It is directed to or supports.The pump piston can be by only as the drive device 29 representated by its reference, (roller lifter, cam drive
Dynamic device) it is placed in reciprocating motion, this is shown by the double-head arrow 30 marked in side.Spring-leaf retainer 31 is pressed in pump piston 28
Lower end section 52 in Fig. 1 on, the spring-leaf retainer is loaded by helical spring 32 with axial force.Pump piston 28 and pump case
Body 26 limits conveying chamber 34.The conveying chamber 34 can be connected by inlet valve 36 with low pressure line 16.In addition, the conveying chamber 34 can
It is connected by outlet valve 38 with pressure duct 20.
Not only inlet valve 36 but also outlet valve 38 is embodied as check-valves.Here, being not shown but it is possible that inlet valve 36 is real
Apply as control valve.In the case of such inlet valve, inlet valve 36 can be mandatory during the conveying stroke of pump piston 28
Ground is opened so that fuel is not transported in fuel rail 22, but is back transported in low pressure line 16.Thus, can adjust
Fuel quantity in fuel rail 22 is transported to by piston type fuel pump 18.
Pump piston 28 is directed in pump gas cylinder 40, and on this point, the pump gas cylinder is the part of pump case 26.Pump is lived
Plug 28 has upper end section 42 in Fig. 1 on the end towards conveying chamber 34.In addition, in the upper end section 42
Around, pump piston 28 has the convex shoulder of the annular of the type for the round collar 44 diametrically stretched out.Pump piston 28 is in other words
Convex shoulder 44 and the supporting structure being made up of plastic components 46 and sealing structure clamping, wherein, plastic components 46, which have, is used for pump work
28 axially directed and/or radial support the guiding area 48 in pump gas cylinder 40 of plug and the sealing area for being configured to sealing lip
50.In figs. 6 and 7 it is better seen that convex shoulder 44 and the plastic components 46 with guiding area 48 and sealing area 50.Convex shoulder 44
The first guide section 51 is especially collectively formed with plastic components 46, pump piston 28 is by means of first guide section in pump gas cylinder 40
In be diametrically directed to.
In addition, on its end away from conveying chamber 34, pump piston 28 has in lower end more noted earlier
Portion's section 52.Around the lower end section 52, sealing bearing 54 is fixedly placed in pump case 26.In sealing bearing
Between 54 and pump case 26, O-ring packing 56 is provided with groove 58.Sealing bearing 54 has cylindrical sections 60, the cylindricality
Section coaxially extends relative to pump piston 28 and helical spring 32 is oriented to by means of the cylindrical sections.Helical spring 32 along
Sink in the spring-reception groove 64 of sealing bearing 54, there, helical spring is pressed against at least range selector of piston longitudinal axis 62
Sealing bearing 54 is axially supported.In a word, it is inverted hat to seal bearing 54 in shown section diagram.
In addition, sealing bearing 54 internally has the reception section 66 of cylinder, the reception section is substantially by column region
The internal circumferential wall of section 60 is formed.In the reception section 66, annular piston seal 68 is consolidated relative to the position of pump case 26
Surely arrange, wherein, piston seal 68 has the cross section of about H-shaped.In addition, the footpath in the nose portion of cylindrical sections 60
Into the flange segments 70 upcountry extended, the second guide section 72 is fixedly arranged also relative to the position of pump case 26.Especially
Ground, the guide section 72 of piston seal 68 and second are connected with the sealing force closure of bearing 54.In Fig. 1 in piston seal
Region on 68 is also indicated as " fuel-side " and the region under the second guide section 72 is also indicated as " oily side ".
Currently, the second guide section 72 is embodied as (second) plastic components 72a.Therefore on the axial direction of pump piston 28
See second guide section 72 being significantly spaced apart with the first guide section 51 (the first plastic components 46 in other words) (in other words
Second plastic components 72a) with the first guide section 51 (guiding areas 48 of plastic components 46 in other words) pump piston is provided jointly
28 radially-directed, two dot point in other words.Here, sealing bearing 54 not only fixed piston seal 68 but also is fixed second and led
To section 72.In this it is to be noted, that the first guide section 51 and the second guide section 72 can also be realized independently of one another.
The supporting-point of second guide section 72 is located at by helical spring 32 in other words by the bottom in Fig. 1 of pump piston 28
The power of unshowned cam driving gear on end regions 52 is imported near point.Therefore, the torque that can reduce bearing position is born
Lotus., can be by the supporting structure point by the way that the supporting structure is divided into the first guide section and the second guide section 51 and 72
The upper end section 42 of pump piston 28 is not arranged on nearby and near lower end section 52, can reduce the shadow of cross force with this
Ring.Also further compare Fig. 3 and 4 below.Therefore, can be realized using plastic components by caused less support loading therewith
46 and 72a.
Fig. 2 shows the work in sealing bearing 54 and the second guide section 72 the region similar to Fig. 1 lower areas
The longitudinal cross-sectional view of plug petrolift 18.Currently, sealing bearing 54 is embodied as steel deep-draw part, but it is alternatively working of plastics.
Arranged it can be seen that the second guide section 72 is directly adjacent to piston seal 68.Especially, the second guide section 72 is arranged in work
On that side towards drive device 29 for filling in seal 68.
In addition, as can be seen from Figure 2, piston seal 68 has six circular and footpaths altogether on inner radial section
To the sealing lip 80 being directed inwardly toward, wherein, the sealing lip is axially relative to reversely with each other into three and three ground respectively
Arrangement.Be disposed with altogether on the radially outer section of piston seal 68 two radially around protuberance shape sealing section
82.Therefore, sealing lip 80 (" dynamically ") is sealed against the radially outer plane for the pump piston 28 being axially movable, and
Seal section 82 (" statically ").Reception section 66 against sealing bearing 54 is sealed (see Fig. 1)
In addition, can be seen that in fig. 2, the second annular plastic components 72a has substantially the second guide section 72 in other words
The radial cross-section of upper L-shaped.
Fig. 3 shows pump piston 28 and acts on the first schematic illustration of power thereon, as they are according to prior art
Piston type fuel pump 18 previously known embodiment in it is possible so.In the middle area in figure 3 of pump piston 28
In section and top section, two bearings diametrically acted on 84 and 86 are schematically shown in the right part of accompanying drawing.In figure 3
In lower left quarter region, a cross force 88 diametrically acted on is acted in the region of lower end section 52 of pump piston 28.
Such as (being marked in figure 3 by arrow) cross force 88 is to be delivered to spring base by helical spring 32 and/or by drive device 29
The summation of cross force on circle 31.
Double-head arrow 90 and 92 mark bearing 84 and 86 and determined by cross force 88 power import point axial location it
Between corresponding axial distance.It can be seen that, ground is determined by relatively small axial distance between bearing 84 and 86, passes through transverse direction
The torque that power 88 is applied on pump piston 28 causes radial load relatively large on pump piston 28 in the region of bearing 84 and 86.
Fig. 4 shows pump piston 28 and acts on the second schematic illustration of power thereon, as they are according to the present invention
It may occur in which so in piston type fuel pump 18.Different from the previously known embodiment according to Fig. 3, in bearing 84 and 86
Axial distance between (bearing is respectively corresponding to the first guide section and the second guide section 51 and 72) is relatively large.Accordingly
Ground, the torque being applied to due to cross force 88 on pump piston 28 are only resulted in the region of piston seal 68 and in bearing
84 and 86 radial loads relatively small on pump piston 28 in the region of first and second guide sections 51 and 72 in other words.Thus,
Can improve in other words 72 can be by plastics material according to the fatigue strength and/or guide section 51 of the piston type fuel pump 18 of the present invention
Material, for example it is made up of polyamide (PA) and/or polyether-ether-ketone (PEEK).
Fig. 5 shows 28 and second guide section of pump piston, 72 common another schematic illustration.Pump piston 28 has outer straight
Footpath M and plastic components 72a has interior diameter W to the second guide section 72 in other words.The axial dimension tool of second guide section 72
There is length L.Pump piston 28 is farthest obliquely depicted in the second guide section 72, wherein, in piston longitudinal axis
Angle [alpha] is produced between 62 and the longitudinal axis 94 of piston type fuel pump 18.
Gap S of the pump piston 28 in the second guide section 72 can be asked for whereby：S=W-M.Correspondingly, this can be favourable
's：On the one hand the radial clearance S between the second guide section 72 and pump piston 28 and the ratio of on the other hand axial length L are use up
May be small, and be, for example, less than 0.01.For purposes of simplicity, do not consider the first guide section 51 (see figure in the display shown in fig. 5
1) effect.
Currently, the configuration for the first guide section 51 of plastic components 46 is especially interesting.Therefore, referring now to
Fig. 6 and 7 inquires into the plastic components in further detail：
Fig. 6 shows the local section diagram of Fig. 1 piston type fuel pump 18, wherein, it may be clearly seen that plastic components
46.In figure 6 in upper area, plastic components 46 have the insertion section 74 in straight tube section form, the insertion section phase
It is coaxial for pump piston 28 and by pump piston 28 through being in other words pulled on pump piston.In figure 6 in lower area, plastics
Element 46 passes through convex shoulder 44 and the clamping of pump piston 28.Especially, the radial direction of the shell surface for being present in convex shoulder 44 of plastic components 46
Guiding area 48, pump piston 28 pass through the supporting to the support region that outside material area composition has been mentioned above in other words
Guiding area is slidably guided in pump gas cylinder 40 and is radially supported by other words in region.
Guiding area 48 has about 3/100mm unrecognizable in the accompanying drawings apart from the internal circumferential wall 76 of pump gas cylinder 40
The spacing of (millimeter).In the axial direction, it is configured to the sealing area 50 of sealing lip and then along piston longitudinal axis 62
Guiding area 48 extends towards conveying chamber 34.Here, sealing lip 50 is as the shaping on guiding area 48 and to radially outer
Flexibly preloaded tube section substantially coaxially extends relative to pump piston 28.Guiding area 48 and sealing area 50 are being schemed
Formed in 6 and 7 single type.
As so enlargedly seeing again in the figure 7, sealing lip 50 abuts in the inside of pump gas cylinder 40 under pre-tension
On circumferential wall 76.Between sealing lip and sealing area 50, notch be present in plastic components 46, the notch forms pressure support ventilation
Region 78.The pressure support ventilation region 78 is so formed so that when pump piston 28 moves towards top dead centre, i.e. in piston type fuel
In the conveying stroke of pump 18, leading pressure is accounted in conveying chamber 34 and works in pressure support ventilation region 78 and therefore also exists
Worked on the free outside of sealing lip, thus, in addition to pretightning force, the sealing lip 50 is hermetically added towards wall 76
Carry.
Claims (18)
1. the piston type fuel pump (18) with pump piston (28), the pump piston have an end region towards drive device (29)
Section (52), it is characterised in that the pump piston (28) is oriented to by means of at least one first guide section and at least one second
Section (51,72) is diametrically directed to, also, first guide section and the second guide section (51,72) are in the axial direction
It is spaced from each other, wherein, first guide section (51) is arranged in the pump gas cylinder (40) of the piston type fuel pump (18),
And second guide section (72) is arranged in the region of the end section (52) towards drive device (29),
Second guide section (72) is directly adjacent to a piston seal (68) arrangement,
The piston type fuel pump include sealing bearing (54), the sealing bearing not only fix the piston seal (68) but also
Fixed second guide section (72),
Around the end section (52) towards drive device (29), the sealing bearing (54) is fixedly placed on described
In the pump case (26) of piston type fuel pump (18).
2. piston type fuel pump (18) according to claim 1, it is characterised in that the second guide section (72) arrangement
On that side of the direction drive device (29) of the piston seal (68).
3. piston type fuel pump (18) according to claim 1 or 2, it is characterised in that the piston seal (68) exists
There is the sealing lip (80) of at least two reversed arrangements in the axial direction on inner radial section.
4. piston type fuel pump (18) according to claim 1 or 2, it is characterised in that the piston seal (68) exists
Include the sealing section (82) of at least one diametrically circular protuberance shape on radially outer section.
5. piston type fuel pump (18) according to claim 1 or 2, it is characterised in that second guide section (72)
For radial cross-section annular and with substantially L-shaped.
6. piston type fuel pump (18) according to claim 1 or 2, it is characterised in that second guide section (72)
Radial clearance (S) and the ratio of the axial length (L) of second guide section (72) between the pump piston (28) is small
In 0.01.
7. piston type fuel pump (18) according to claim 1 or 2, it is characterised in that the pump piston (28) is described
There is the supporting structure and sealing structure (46) for the pump piston (28) on first guide section (51), wherein, the branch
Bearing structure and sealing structure (46) include being used for the guiding for being radially oriented to the pump piston (28) in the pump gas cylinder (40)
Region (48) and including with sealing lip sealing area (50).
8. piston type fuel pump (18) according to claim 7, it is characterised in that the piston type fuel pump includes plastics
Element (46), the supporting structure and sealing structure (46) are made up of the plastic components (46).
9. piston type fuel pump (18) according to claim 7, it is characterised in that the supporting structure and sealing structure
(46) it is permanently connected with the pump piston (28).
10. piston type fuel pump (18) according to claim 9, it is characterised in that the pump piston (28) has annulus
The convex shoulder (44) of shape, the supporting structure and sealing structure (46) and the convex shoulder clamping and/or bonding.
11. piston type fuel pump (18) according to claim 10, it is characterised in that the convex shoulder (44) is arranged in described
Around the end section (42) of the conveying chamber (34) of the direction piston type fuel pump (18) of pump piston (28).
12. piston type fuel pump (18) according to claim 7, it is characterised in that the supporting structure and sealing structure
(46) form single type.
13. piston type fuel pump (18) according to claim 7, it is characterised in that the supporting structure and sealing structure
(46) form multi-piece type.
14. piston type fuel pump (18) according to claim 13, it is characterised in that the supporting structure and sealing structure
(46) the mutual clamping in part and/or bonding.
15. piston type fuel pump (18) according to claim 7, it is characterised in that in pump gas cylinder (40) and guiding area
(48) existing gap is in the range of about 1/100mm to about 10/100mm between.
16. piston type fuel pump (18) according to claim 7, it is characterised in that second guide section (72) and/
Or the supporting structure and sealing structure (46) include plastic material.
17. piston type fuel pump (18) according to claim 15, it is characterised in that in pump gas cylinder (40) and guiding area
(48) existing gap is about 3/100mm between.
18. piston type fuel pump (18) according to claim 16, it is characterised in that second guide section (72)
And/or the supporting structure and sealing structure (46) include polyamide (PA) and/or polyether-ether-ketone (PEEK).
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102012224029.2 | 2012-12-20 | ||
| DE102012224029 | 2012-12-20 | ||
| DE102013226062.8 | 2013-12-16 | ||
| DE102013226062.8A DE102013226062A1 (en) | 2012-12-20 | 2013-12-16 | Piston fuel pump for an internal combustion engine |
| PCT/EP2013/076799 WO2014095781A1 (en) | 2012-12-20 | 2013-12-17 | Piston fuel pump for an internal combustion engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104854341A CN104854341A (en) | 2015-08-19 |
| CN104854341B true CN104854341B (en) | 2018-04-10 |
Family
ID=49515324
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201380066852.4A Active CN104870802B (en) | 2012-12-20 | 2013-10-17 | Piston fuel pump for internal combustion engine |
| CN201380065757.2A Active CN104854341B (en) | 2012-12-20 | 2013-12-17 | Piston type fuel pump for internal combustion engine |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201380066852.4A Active CN104870802B (en) | 2012-12-20 | 2013-10-17 | Piston fuel pump for internal combustion engine |
Country Status (8)
| Country | Link |
|---|---|
| US (2) | US10767644B2 (en) |
| EP (2) | EP2935859B1 (en) |
| JP (2) | JP6080976B2 (en) |
| KR (2) | KR102089243B1 (en) |
| CN (2) | CN104870802B (en) |
| DE (2) | DE102013226062A1 (en) |
| ES (2) | ES2620354T3 (en) |
| WO (2) | WO2014095120A1 (en) |
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- 2013-10-17 EP EP13785376.8A patent/EP2935859B1/en active Active
- 2013-10-17 JP JP2015548299A patent/JP6080976B2/en active Active
- 2013-10-17 CN CN201380066852.4A patent/CN104870802B/en active Active
- 2013-10-17 WO PCT/EP2013/071737 patent/WO2014095120A1/en active Application Filing
- 2013-10-17 KR KR1020157016203A patent/KR102089243B1/en active IP Right Grant
- 2013-10-17 US US14/651,249 patent/US10767644B2/en active Active
- 2013-10-17 ES ES13785376.8T patent/ES2620354T3/en active Active
- 2013-12-16 DE DE102013226062.8A patent/DE102013226062A1/en not_active Withdrawn
- 2013-12-16 DE DE102013226088.1A patent/DE102013226088A1/en active Pending
- 2013-12-17 KR KR1020157016091A patent/KR102100095B1/en active IP Right Grant
- 2013-12-17 WO PCT/EP2013/076799 patent/WO2014095781A1/en active Application Filing
- 2013-12-17 JP JP2015548424A patent/JP6045717B2/en active Active
- 2013-12-17 US US14/652,211 patent/US10428814B2/en active Active
- 2013-12-17 ES ES13808000.7T patent/ES2656663T3/en active Active
- 2013-12-17 CN CN201380065757.2A patent/CN104854341B/en active Active
- 2013-12-17 EP EP13808000.7A patent/EP2935860B1/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| JP2016500421A (en) | 2016-01-12 |
| KR20150093710A (en) | 2015-08-18 |
| KR102100095B1 (en) | 2020-04-13 |
| JP6080976B2 (en) | 2017-02-15 |
| ES2656663T3 (en) | 2018-02-28 |
| KR102089243B1 (en) | 2020-03-16 |
| WO2014095781A1 (en) | 2014-06-26 |
| CN104870802A (en) | 2015-08-26 |
| JP2016500418A (en) | 2016-01-12 |
| CN104870802B (en) | 2018-11-02 |
| EP2935860B1 (en) | 2017-10-18 |
| WO2014095120A1 (en) | 2014-06-26 |
| EP2935859B1 (en) | 2016-12-21 |
| US10767644B2 (en) | 2020-09-08 |
| KR20150093709A (en) | 2015-08-18 |
| DE102013226062A1 (en) | 2014-06-26 |
| JP6045717B2 (en) | 2016-12-14 |
| ES2620354T3 (en) | 2017-06-28 |
| US20150369190A1 (en) | 2015-12-24 |
| US20150308394A1 (en) | 2015-10-29 |
| CN104854341A (en) | 2015-08-19 |
| EP2935859A1 (en) | 2015-10-28 |
| EP2935860A1 (en) | 2015-10-28 |
| US10428814B2 (en) | 2019-10-01 |
| DE102013226088A1 (en) | 2014-06-26 |
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